Portable power bank



FIG. 1 is a right side view of the portable power bank.

FIG. 2 is a front view of the portable power bank.

FIG. 3 is a left side view of the portable power bank.

FIG. 4 is a rear view of the portable power bank.

FIG. 5 is a top view of the portable power bank.

FIG. 6 is a bottom view of the portable power bank.

FIG. 7 is a front right perspective view of the portable power bank; and,

FIG. 8 is a rear right perspective view of the portable power bank. 

CLAIM The ornamental design for a portable power bank, as shown and described. 